内网到外网的隧道
今天需要在内网机器上安装一个包，而且没有与系统版本匹配的rpm. 所以只能自己编译安装。编译时出现错误，原因是系统没有安装gcc. 只好再安装gcc，然而再次出现问题，发现缺少gcc的依赖了，而且是一堆的依赖包. 没有办法，只能再一个个安装依赖包. 相信手动安装过linux软件的人，能够深深体会到相互依赖问题会让人有多痛苦。 好不容找到这些特定版本的包，最后出现悲剧了，貌似其中几个依赖包，由版本比较老，网上已经没有了。而且由于内核版本的原因，gcc也只能安装这个版本的。
结果出现了安装某个包，需要gcc，安装gcc，需要依赖包，部分依赖包找不到。并且内核限制了只能安装这个版本的gcc。并且系统的安装盘是精简版的，没有常用软件的安装包.
找依赖包已经让人很痛苦了，结果是这样，让人很恼火. 下定决心要在内网机器上使用yum，用它来解决这个问题。
为达到这个目的，需要在内网和外网间搭一条隧道，让内网能访问外网。
工作的网络环境
工作是在外网，系统在独立的内部网络。在外网访问内网需要通过专门的vpn软件。
这个vpn软件，只能运行在windows下，使外网机器拥有临时的内网地址，运行时外网机器不能访问外网。
其中网内到外网的端口转发
proxychains ssh -N -D 1090 wyq@192.168.1.102
这里面最要的不是怎么建数据通道，而是怎么绕过这个特定的vpn软件.
工作原因实现方法只能略说.
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